A098209 - OEIS

%I #7 Jun 27 2020 16:37:19

%S 0,48,4488,444888,44448888,4444488888,444444888888,44444448888888,

%T 4444444488888888,444444444888888888,44444444448888888888,

%U 4444444444488888888888,444444444444888888888888

%N a(n) = A067275(n+1)^2 - 1.

%C Certain functions of near or generalized repdigits provide interesting digit patterns like e.g: -1+(666666667)^2=444444444888888888.

%Y Cf. A067275, A096507.

%K nonn

%O 0,2

%A _Labos Elemer_, Oct 20 2004

%E Definition corrected by _Georg Fischer_, Jun 27 2020